LTS Refresh: Merge release-R121-cos-6.6 up to 8efce2be551b BUG=b/553150597 TEST=presubmit RELEASE_NOTE=LTS Refresh from main-R121-cos-6.6 to release-R121-cos-6.6 cos-patch: lts-refresh Change-Id: I537e60f11ef72111b17543f691b716ae2c07cdb2 Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/190426 Reviewed-by: Kevin Berry <kpberry@google.com> Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>